Just some links to help you make the theme your own, if you're not sure where to start.

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Fonts

• Google Fonts - tons of fonts
  
• Fontjoy - Pairings
  
• Monotype - Pairings
  

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Buttons

• CSS Scan - Style Gallery
  
• Devsdash - Button generator
  

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Icons

• Font Awesome - Popular, lots of free icons
  
• The Noun Project - Icons for things you didn't know you needed (not free)
  
• Google Material Icons/Symbols (what you see here)
  
• Line Icons